Tying a scarf or other piece of material around the neck during masturbation to abstruct blood flow to the head, and increase the pleasure at climax.

Brian: If I want to experience the joys of scarfing, what the hell business is it of yours?!
Michael: It's my business cause I'm the one that will get the call from the the god damn cleaning lady who finds you hanging from the rafters with a fucking boner!

The practice of intentionally reducing the amount of oxygen to the brain during sexual stimulation in order to heighten the received pleasure from orgasm. Not neccessarily done during masturbation, this can be more safe/fun with a partner.

Ronnie ate a hamburger, some chips, a taco, some hot dogs, some curly fries, an ice cream cone, some currie powder, a couple of soft-pretzles, a pot pie or two, and 8 twinkies, all in 3 minutes. HE was TOTALLY scarfing.